i have this led, and im not sure what resistor to use to drop the 5v current to an appropriate voltage and produce the appropriate current.
the LED is rated at 200mA, but the data sheet says i should apply 150mA through it. my micro-controller outputs 5v i think, but im not sure as i do not have a multimeter, but i apply 5v to the vcc of the micro-controller.
my questions are:
- what resistor should i use with this led? (i got 33 ohms as the answer, making me thing i dont need a resistor).
- if i do need a resistor, would a 1/2 watt rated resistor work? the lowest value i have is 100 ohm, is that close enough?
- the data sheet does not explain how to solder the LED- do i just connect the b- and r- points to ground and the b+ and r+ to micro-controller outs, and if i want blue i do low r+ and high b+?
Sorry about the extensive questions, i never had any formal education or experience in this field. thanks!